A new version of the ArduIMU series is going to be stocked very soon. The ArduIMU v3 is the latest in the low cost and small IMUs which is arduino compatible (ATmega328 @16Mhz).This IMU includes the new MPU-6000 which has a tripple axis accelerometer and gyro built in. The MPU-6000 also takes care of sensor fusing with 24bit ADC sampling. This IMU also includes the HMC-5883L tripple axis magnetometer. You can use this for many applications that require motion measurement, such as a multi-rotor helicopter, model rockets, and many other robotics applications. Read more for the full feature list.